T-cell responses induced by ChAdOx1 nCoV-19 (AZD1222) vaccine to wild-type severe acute respiratory syndrome coronavirus 2 among people with and without HIV in South Africa by McMahon, WC, Kwatra, G, Izu, A, Koen, AL, Greffrath, J, Fairlie, L, Patel, F, Mukendi, CK, Mbele, NJ, Lala, R, Burgers, WA, Nunes, MC, Cutland, CL, Gilbert, SC, Lambe, T, Pollard, AJ, Madhi, SA